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Consider it a convention. Basically, it doesn't make much sense to register many more digits after a digit that is uncertain. Another common convention is to enclose uncertain digits - often the last two digits shown - in parentheses, for example, 6.67384(80)Ã—10âˆ’11 for the gravitational constant in SI units.,

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Q: Why is the last significant digit recorded in measurement uncertain?

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A term Significant Figure refers to all the certain digits and one uncertain digit in a measurement.

All the digits are significant in this case. A zero between other digits is always significant, and all zeros after the decimal point are significant.

170.040 has six significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.

All digits are significant in this case. Any digit after a decimal point is a significant digit.

Integers ending in 0 are ambiguous cases. The measurement could be accurate to the units digit and in that case all three digits are significant. But is could be accurate to the nearest ten, in which case, only the first two digits are significant.

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A term Significant Figure refers to all the certain digits and one uncertain digit in a measurement.

One is certain and the other in uncertain.

the last number.

The significant figures in a measurement include all digits measured exactly, plus one estimated digit.

Your measurement should include one estimated digit.

At most 1.

significant figures

3 - assuming the trailing 0s are there for a reason.

43.52 centimeters (cm) has four significant figures. The final figure in place four of '2' is the most uncertain. This is because the measurement device or calculation may have originally been 43.516 through 43.519 before rounding or due to instrumentation uncertainty.

It is not a measurement, therefore, it is infinitely precise. There is no uncertainty in the number.

All the digits are significant in this case. A zero between other digits is always significant, and all zeros after the decimal point are significant.

490 to 2 s.f. Note that when the significance is uncertain, you must specify it (s.f. is an abbreviation of significant figures). You can also underline the last significant digit: 490

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